How long should a first heat and bleeding last in 8-10 month old German Shepard?

The first heat cycle in German Shepherds typically lasts for about 2-3 weeks, and the bleeding usually occurs for the first 7-10 days of the cycle. However, it can vary from dog to dog, so it's always a good idea to consult with a veterinarian if you have any concerns about your dog's heat cycle.